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A variable is a letter that represents a number. An expression that contains at least one variable is called variable expression, also called algebraic expression. A variable expression has one or more terms. A term is a number, a variable, or a product of numbers and variables. For example,
3(x^2)y + 2xy + x - 7 is a variable expression, where you have 4 terms.
When working with variable expression, you often use the substitution principle:
If a = b, then a may be replaced by b in any expression.
The set of numbers that a variable may be represent is called replacement set, or domain, of the variable. To evaluate a variable expression, you replace each variable with one of its values and simplify the numerical expression that results.
Example: Evaluate the expression 2x - 4y for x = 5 and y = -9.
Solution:
2x - 4y
= 2(5) - 4(-9)
= 10 + 36
=46
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What do you call replacing a variable in an in a algebraic expression with a quantiy?
When you replace a variable with a quantity, it is called a substitution.
How do you evaluate an algebraic expression?
You have to substitute a value for the letter variable in the expression. This is what we call evaluating the algebraic expression. An example would be 3x+1=7, when x=2.
What do you call a number in front of a variable?
Like the 7 in the expression 7x? If so that is called the coefficient.
What do you call a letter that stands for a number in an equation?
It is called a variable
What is twice a number plus 27 in an algebraic expression?
Twice a number can be represented as 2x, where x is the unknown number. Adding 27 to this expression gives 2x + 27. Therefore, "twice a number plus 27" can be written as the algebraic expression 2x + 27.
What do you call replacing a variable in an expression by a number and simplifying the result?
That is called 'solving'.
What do you call replacing a variable in an algebriac expression with a quantity?
substitution
What do you call replacing a variable in an algebraic expression with a quaintity?
I think it is called "replacing" or "substitution".
What do yo call replacing a variable in a algebraic expression with a quantity?
Substitution
What do you call replacing a variable in an in a algebraic expression with a quantiy?
When you replace a variable with a quantity, it is called a substitution.
What do you call the number that are multiplied by the variable in an algebraic expression?
factor
What is the algebraic expression for the product of 14 times a number?
Assuming you call your number "n", the expression would be "14n". You can replace "n" with whatever variable you want to use.
What do you call a number that stands alone in an equation?
You can call it a "number." To distinguish it from a variable expression, you can also call it a "constant."
What do you call a number that multiplies a variable?
A coefficient is a number that multiplies a variable.
What is a number that has no variable attached to it?
We call a number that has no variable attached to it, a constant. A number attached to a variable, as in 3x, is called a coefficient.
How do you evaluate an expression?
You have to substitute a value for the letter variable in the expression. This is what we call evaluating the algebraic expression. An example would be 3x+1=7, when x=2.
How do you evaluate an algebraic expression?
You have to substitute a value for the letter variable in the expression. This is what we call evaluating the algebraic expression. An example would be 3x+1=7, when x=2.
